Great Idea! I left a note over there saying that I've been using a metal one I got from Judie Rothermel that has a non slip texture on the back. This is what I've been using to make my I SPY, but this idea is wonderful! So glad you shared it.I might suggest trying to put clear nail polish on the back w/some sea salt or sand while wet to make it non slip. But just an idea. XO